About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Dispersive Shear Bands on the Surface of Layered Heterostructured Materials |
Author(s) |
Yanfei Gao, Yanchun Zhao, Yuntian Zhu |
On-Site Speaker (Planned) |
Yanfei Gao |
Abstract Scope |
Hetero-deformation-induced (HDI) strengthening mechanism has been well investigated in heterostructured materials including layered/gradient materials prepared by surface attrition or other processing techniques. However, the ductility studies are rather restricted to the delay of the Considère necking limit due to the elevated work hardening. This view is incomplete, because the onset of necking (i.e., the uniform ductility) depends critically on both the amplitude and wavelength of initial perturbations. Here using a sandwich structure as an illustrative example, we demonstrate that the origin of these shear bands be localized necking with intermediate wavelengths and inclined orientations, which are critically dictated by the hardening behavior of the constituent layers, the geometric parameters, and the initial morphological perturbations. Findings in this work not only resolve the origin of recent unusual experimental observations, but also suggest an alternative way of understanding and improving the ductility in heterostructured materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, |